108/49 is the "Gauge" of the bore of the rifle. Same criteria as for a 12, 16 20 Etc This marking is normally found on guns made prior to 1912 & it may or may not be nitro proofed. The 108/49 gauge translates to a bore dia of .350". This could well be for lead 9.3 bullets. There should also be a case length marking, the 9.3 came in several different case lengths besides the 72 one.
A chamber cast is always a very good idea on these guns.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra